In a rare interview, a terrorist in training reveals chilling secrets about the insugency's deadliest weapons

One day soon, this somber young man plans to offer up a final prayer and then blow himself up along with as many U.S. or Iraqi soldiers as he can reach. Marwan Abu Ubeida says he has been training for months to carry out a suicide mission. He doesn't know when or where he will be ordered to climb into a bomb-laden vehicle or strap on an explosives-filled vest but says he is eager for the moment to come. While he waits, he spends much of his time rehearsing that last prayer. "First I will ask Allah to bless my mission...